customer brought this game in dead.there is no display or lamps lit.leds are on & at power up short burst of audio from speaker.all fuses are good.the 18 volt source for lamp columns is low(7v) & 12v source is down to 2v.can't find any faults on power board.need some help on this one,george

 

Suspect power supply filter capacitors.

 

already checked them.esr & value ok.

 

The next most likely failure is connectors.